A.to windward should be opened and the ones to leeward should be closed
B.to leeward should be opened and the ones to windward should be closed
C.should be opened
D.should be closed
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A.squaring the corners
B.rounding the corners
C.plug welding the corners
D.slot welding the corners
A.cast iron
B.forged steel
C.stainless steel
D.cast steel
A.timber or steel rails
B.locomotives or boilers
C.railway passenger coaches
D.motor vehicles
A.reduces and prevents corrosion of standing rigging
B.prevents corrosion of running rigging
C.reduces and prevents wear caused by the rubbing of one object against another
D.protects the body against extreme cold
A.the Coast Guard
B.the ABS
C.the shipyard fire department
D.a certified marine chemist
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The burden of proving unseaworthiness is upon those who（）it.
Before welding in a tank that has carried petroleum products，the tank must be certified by （）.
The conclusion is（）the said ship is fit to continue to sail.
Cracks may be prevented from developing at the corners of welded plating inserts by（）.
In order to withstand fluid head pressure on a ship，stiffeners are often attached to the bulkhead（）.
Connecting elements of a mooring system should be fabricated from（）.
The anchors on the bow are known as（）.
The bottom of the mast rests on a part of the keel called the mast（）.
The end of the joint with the exterior threads is called the（）.
The angle between the flukes and the shank of an anchor is called the（）.